FDI P2131, Technical Manual, Page: 62 / 161

3.4.3 Testing Free Chlorine Level
Free chlorine is the available chlorine found in water to disinfect the water from contaminates,
which prevents the water from fowling. If no free chlorine is present, water can foul. Free
chlorine, in water, will completely evaporate within 24 hours and the evaporation rate increases
when the water is exposed to the atmosphere. Trace amounts of free chlorine will be filtered out
through the SWS Deionizing (DI) cartridge.
Using the free chlorine test strips provided in the SAB, test the supply water and SWS outlet water
stream every time the SMU jacket and WRS are drained and refilled (e.g., every 14 days or 100
cycles, whichever occurs first). Follow the instructions listed on the chlorine test strip container
to test the Free Chlorine Level.
Test the supply water and outlet water stream as shown below:
FDI’s recommended Free Chlorine Levels:

Free Chlorine Level Range

Supply Water (ppm) 0.5 2.6
SWS Outlet Water Stream (ppm) ≥ 0.2
1. If the SWS outlet water stream reads < 0.2 ppm, flush the SWS for another 2 minutes. If the
test strip still reads < 0.2 ppm, this is an indication that the supplied water may not contain
enough free chlorine.
2. If the supply water reads < 0.2 ppm, it may be necessary to adjust the treatment of the source
water.
3. If Steps 1 and 2 have been trialed and the SWS outlet water stream continues to read < 0.2
ppm, the P2131 may still be filled and operated. The efficacy of the P2131 is not impacted by
free chlorine levels.
Chlorine Test Strip
P/N: P2131 ‐ 3 ‐ 9007
1. Locate and test the
supply water with
the test strip
2.
Connect the supply
water to SWS
3. Connect the
Outlet Hose
Connection to
the SWS
4. Flush the SWS
for 2 minutes
5. Test the SWS
outlet water
stream with
the test strip
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